1387213 has 2 divisors, whose sum is σ = 1387214. Its totient is φ = 1387212.

The previous prime is 1387207. The next prime is 1387231. The reversal of 1387213 is 3127831.

Together with next prime (1387231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 887364 + 499849 = 942^2 + 707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1387213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 693606 + 693607.

It is an arithmetic number, because the mean of its divisors is an integer number (693607).

2^1387213 is an apocalyptic number.

It is an amenable number.

1387213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387213 is an equidigital number, since it uses as much as digits as its factorization.

1387213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 1387213 is about 1177.8000679232. The cubic root of 1387213 is about 111.5272644756.

It can be divided in two parts, 1387 and 213, that added together give a square (1600 = 40²).

The spelling of 1387213 in words is "one million, three hundred eighty-seven thousand, two hundred thirteen".